Lens-grinding machine



L. e. SiMPSON. LENS GRINDING-MACHINE. APPLlCATlON FILED NOV 80 \918 v vPatented June 14, 1921.

% ATTORNEYS 1 UNITED STATES OFFICE.

LEON G. SIMPSON, OF ROCHESTER, NEW YORK, ASSIGNOR TO BAUSCH 8c LOMBOPTICAL COMPANY, OF ROCHESTER, NEN YORK, A CORPORATION OF NEW YORK.

LENS-GRINDING MACHINE.

1,381,245. Specification of Letters Patent PatentedJune14, 1921.

To all whom z'tmay concern.

Be it known that I, LEON G. SIMPSON, a citizen of the United States,residing at Rochester, in the 1 county of Monroe and State of New York,have invented certain new and useful Improvements in Lens- GrindingMachines; and I do hereby declare the following to be a full, clear, andexact description of the same, reference being had to the accompanyingdrawings, forming a part of this specification, and to thereference-numerals marked thereon.

My invention relates to lens grinding and polishing machines and moreparticularly to machines of the type known as prescription grindingmachines. The object of my invention is to provide an improvedoverhanging-arm for the work carrier of such machines which is rotatablyand longitudinally adjustable in its support for the purpose of bringingthe lens being ground into cooperation with any desired part of thegrinding shell or lap. Another object of the invention is to provide anoverhanging arm forlens grinding machines which is adjustable to varythe leverage thereof. More pecifically, the object of my invention is tomount the work carrier spindle on the overhanging arm to be adjustablelongitudinally thereof, the overhanging arm itself being mounted foruniversal adjustment in a support which itself is adjustableconcentrically with the axis of the grinding lap for right or left handoperators.

' In the drawings; a

Figure 1 is a sideelevation of a lens grinding machine illustrating oneembodiment of my invention, the base of the machine and one side of thesplash basin being sectioned away,

Fig. 2 is a plan view of the same, one end of the overhanging arm andpart of the table being sectioned away,

Fig; 3 is a detail sectional view of the supporting bracket for theoverhanging arm, and

Fig. 4 is a section on line 4"4 of Fig. 2.

Similar reference numerals in the several figures indicate the sameparts.

My invention relates to lens grinding machines, the principal featuresof which are disclosed but not claimed in my application for patent Ser.No. 119,157, filed Sept. 9, 1916, for lens grinding and polishingmachines, a l

ing through each Application filed November 30,1918. Serial No. 264,848.

lln'said machine, a table or bench l is supported on a frame or by otherpreferred means not shown. A shaft or spindle 2 has a bearing'in thetable and at its lower end is connected with driving means notillustrated herein. At its upper end the shaft 2 receives a grindingorabrading lap or shell 3 which is surrounded bya splash pan or basin 4.It is often desirable to substitute a polishing shell or a grindingshell of different curvature for the one in use and for this purpose theupper end of the shaft 2 is tapered, and to cooperate therewith theabrading implements are sockets as shown at 5. A work carrier 6cooperates with the grinding shell and is held in proper workingposition thereon by means of a carrier spindle 7, which is adjustablysecured in a bracket 8 mounted on the overhanging arm 10. The bracket isclamped to the arm to be adjustable longtudinally thereof. Theoverhanging arm 10 is inthe form of a rod or bar preferably cylindricalin form and extends head 11. A clamping yoke 12 has an openof its legsthrough which the arm 10 extends, and the part of the yoke connectingthe legs lies adjacent the top of the head and has a screw threadedopening which receives a set tion is such that when the set screw isloosened, the arm is rotatably adjustableto incline or tilt the spindle,and also longitudinally adjustable to lengthen or shorten the arm. Whenthe arm is properly adjusted, the set screw 13 is again manipulated toclamp the arm between the head and the clamping yoke to secure it inadjusted position. The head 11 is 14 which forms the head of a shaft orpost 15 journaled in bearing bosses 16 and 17 provided therefor on abracket 18. The

screw 18. The construe provided with tapered trunnioned in a yoke.

arm of the yoke 14 are provided with screw threaded openings, whichreceive the set screws 19, in which the head 11 is pivotally supported.It will be noted that by this arrangement, the arm 10 may be swungin avertical plane about the axis of the trunnions 19 in the yoke 14, andalso laterall about the axis of the post 15. The sha or post 15 may beadjusted vertically, and for this purpose, a collar 20 is securedthereto behind the bosses 16 and 17 by means of a set screw 21. Thecollar 20 fits snugly between the bosses 16 and 17 and serves as a claimand desire to secure by chine, In Fig. 2

operating therewith, a

nation of a grinding shell, operating therewith,

thrust bearing for the post 15, preventing 'axial' movement of the postwhich would end of the slot in said figure, and for a right;liand-operator to the opposite end of the slot; 7

While the invention has been disclosed embodied in a machine in whichthe overhanging arm supports the lens carrier, it

, may quite obviously be adapted to those machines, in which there is areversal of parts,

and in which the grinding shell is carried instead by the overhangingarm, as is old and well known in the art.

Having described my invention, what I Letters Patent is: a

1. In a lens grindin machine, the combination of a grinding shell, alens carrier cobracket adjustable axis of the grinding concentrically,with the shell, and an overhanging arm adapted to carry the lens,carrier and supported by said bracket.

2. In a lens grinding machine, the combia lens carrier cota'table in andadjustable relative to said bracket, acollar adjustably secured to said.post and engaging said bracket to prevent axial thrust of the post inany adjusted position, and can overhanging arm adapted to carry saidlens carrier pivoted to said post.

3. In a lens grinding machine, the combination with a lens carrier andgrinding shell of an overhanging arm pivotally and adjustably mounted tocarry one of them, a

table top on which is rotarily positioned the with a lens carrier, of agrinding operation to carry one of them,

a bracket, a post roother, a bracket supporting the overhanging arm,said bracket being adjustable, to be fixed in difierent locations on thetable top, and means for securing the bracket in adjusted position onthe table top.

4. In a lens grinding machine the combination with a grinding shell, ofa lens carrier for cooperation therewith, a bracket, a rotatable postcarried by the bracket and adjustable for height relative thereto, athrust collar on said post, means on the bracket adapted to cooperatewith either side of the thrust collar to restrict axial thrust of thepost in either direction, and a manually guided arm pivotally supportedby the post and adaptedto support thelens carrier.

5. In a lens grinding machine, the combination with a grinding lap, of alens carrier for cooperation therewith, an arm adapted to support one ofthem, a post to which the arm is adj ustably pivoted, a thrust collaradjustable on the post, a supporting bracket for the post, bearingbosses on the bracket perforated for the reception of the post and incooperation with each face of the thrust collar, and means on the thrustcollar for adjustably clamping the sameto the post.

' 6. In a grinding machine-the combination lap for cotherewith, apivotal arm ada ted a table top on w ich the other is rotarily mounted,a post for supporting the arm from the table,-said table top having anarcuate groove therein substantially concentric with the center line ofthe member rotarily mounted thereon and clamping means in cooperationwith the groove and post to hold the post in any adj usted positionalong the groove.

7. The combination with a work holder,

7 of a cutter for cooperation therewith, a table top on which one ofthem is supported, an overhanging pivoted arm by which the other of themis carried and a post for supporting the arm above the table top, saidpost being adjustable over the table top substantially concentric withthe center of that member which is supported on the table top.

LEON G. SIMPSON.

